Hi Folk,  This may not be a problem, not sure....I moved things around, =
and changed two pieces of equipment.
Someone gave me a DataQ 194 AD converter, and a computer. I relocated =
all the equipment to a different location. Installed the AD board, and =
got everything up and running again.  Everything seemed normal, but =
recorded my first event and on the Helicorder screen of AmaSeis, and =
only the center and top half of the event is seen.  The bottom half of =
the event is cutoff just below the center line, like it was "clipped".   =
 I processed the event and after filtering it, in the normal way, the =
bottom half was then visible, so the final .GIF looks just fine.

I looked at the sensor which is a Vertical Spring sensor, to see if it =
was free to move up and down, and it was.
I checked the magnetic damper, and all seems normal.

It is a new "old computer" and the new "old DataQ AD board, everything =
else is the same.
I did have to install, software on the new computer, AmaSeis, Winquake, =
and DataQ.

All this being said, if I enlarge a small piece of quiet trace, it is =
not clipped.
If I do a drop test on the floor, The spike go up and very little down, =
just like the event trace, yet the sensor will produce a negative and =
positive spike if I force it by blowing on it.  Again only an (above the =
line) spike using a drop test.

I did recalibrate the DataQ and rezero the AmaSeis.








Hi Folk,  This may not be a =
problem, not=20
sure....I moved things around, and changed two pieces of=20
equipment.
Someone gave me a DataQ 194 AD =
converter, and a=20
computer. I relocated all the equipment to a different location. =
Installed=20
the AD board, and got everything up and running again.  Everything =
seemed=20
normal, but recorded my first event and on the Helicorder screen of =
AmaSeis,=20
and only the center and top half of the event is seen.  The =
bottom=20
half of the event is cutoff just below the center line, like it was =

"clipped".    I processed the event and after filtering =
it, in=20
the normal way, the bottom half was then visible, so the final .GIF =
looks just=20
fine.
 
I looked at the sensor which is a =
Vertical Spring=20
sensor, to see if it was free to move up and down, and it =
was.
I checked the magnetic damper, and all =
seems=20
normal.
 
It is a new "old computer" and the new =
"old DataQ=20
AD board, everything else is the same.
I did have to install, software on the =
new=20
computer, AmaSeis, Winquake, and DataQ.
 
All this being said, if I enlarge a =
small piece of=20
quiet trace, it is not clipped.
If I do a drop test on the floor, The =
spike go up=20
and very little down, just like the event trace, yet the sensor will =
produce a=20
negative and positive spike if I force it by blowing on it.  Again =
only an=20
(above the line) spike using a drop test.
 
I did recalibrate the DataQ and rezero =
the=20
AmaSeis.
 
Any ideas?   Thanks,=20
Ted